Also, comparing QMC2's integrated PDF viewer with Firefox's one using FF 27.0.1 on Linux x86_64 I actually see no difference in performance. No surprise though: they use the same JS library.
The only realistic (and open source) alternative to PDF.js that I see is Poppler
, but the reason I refrained from using it is that it has many
library dependencies which should be no problem in the Linux world, but I'd need to include them all in QMC2's code because of platform independence... and that's pure overkill
. However, Poppler is likely faster, mainly because it's written in C++ and can be easily integrated with Qt (which is really nice!), but still...